C# 泛型實現Table與實體的相互轉換

public class ModelHandler<T> where T : new()
    {
        /// <summary>
        /// Table轉換成實體
        /// </summary>
        /// <param name="dt">表</param>
        /// <returns></returns>
        public static List<T> FillModel(DataTable dt)
        {
            if (dt == null || dt.Rows.Count == 0)
            {
                return null;
            }
            List<T> modelList = new List<T>();
            foreach (DataRow dr in dt.Rows)
            {
                //T model = (T)Activator.CreateInstance(typeof(T));  
                T model = new T();
                for (int i = 0; i < dr.Table.Columns.Count; i++)
                {
                    PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
                    if (propertyInfo != null && dr[i] != DBNull.Value)
                        propertyInfo.SetValue(model, dr[i], null);
                }

                modelList.Add(model);
            }
            return modelList;
        }

        /// <summary>
        /// 將一條Table轉換成實體
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static T FillSigleMode(DataRow dr)
        {
            T model = new T();
            if (dr != null)
            {
                for (int i = 0; i < dr.Table.Columns.Count; i++)
                {
                    PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName);
                    if (propertyInfo != null && dr[i] != DBNull.Value)
                        propertyInfo.SetValue(model, dr[i], null);
                }
            }
            return model;
        }


        /// <summary>
        /// 實體類轉換成DataTable
        /// </summary>
        /// <param name="modelList">實體類列表</param>
        /// <returns></returns>
        public static DataTable FillDataTable(List<T> modelList)
        {
            if (modelList == null || modelList.Count == 0)
            {
                return null;
            }
            DataTable dt = CreateData(modelList[0]);

            foreach (T model in modelList)
            {
                DataRow dataRow = dt.NewRow();
                foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
                {
                    dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null);
                }
                dt.Rows.Add(dataRow);
            }
            return dt;
        }

        /// <summary>
        /// 根據實體類得到表結構
        /// </summary>
        /// <param name="model">實體類</param>
        /// <returns></returns>
        private static DataTable CreateData(T model)
        {
            DataTable dataTable = new DataTable(typeof(T).Name);
            foreach (PropertyInfo propertyInfo in typeof(T).GetProperties())
            {
                dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType));
            }
            return dataTable;
        }
    }